DGK Color Tools WDKK Waterproof 18% Gray Color Chart and Warm Card Tool Kit with Stand and Case Versatile waterproof 18% white balance and color reference card and warm card kit includes card, stand, instructions. Front side has precision 12% and 18% gray reference for white balance plus 18-color patches for superior digital color correction Array of 18 color patches with natural, chromatic, primary and gray scale colors, arranged in three rows. Reverse side has warm card for fast, easy "warm" white balance improve skin tones and eliminate cold "electronic" look Card is 100% waterproof with permanent imbedded color for outdoor, underwater, and on-location use.